Tax returns in the United States are reports filed with the Internal Revenue Service (IRS) or with the state or local tax collection agency (California Franchise Tax Board, for example) containing information used to calculate income tax or other taxes. Tax returns are generally prepared using forms prescribed by the IRS or other applicable taxing authority.

Administrative Professionals' Day (previously known as Secretary's Day) is an unofficial secular holiday observed on the last Wednesday of April (April 26 in 2006 April 25 in 2007), to recognize the work of clerical employees such as administrative assistants, receptionists, paralegals, etc. It is celebrated as part of a larger Administrative Professionals Week, which takes place during the last full week of April.

Cinco de Mayo ("The Fifth of May" in Spanish) is a national holiday in Mexico which is also widely celebrated in the United States. It commemorates the victory of Mexican forces led by General Ignacio Zaragoza over the French occupational forces in the Battle of Puebla on 05 May 1862.

Mother's Day is a day honoring mothers, celebrated on various days in many places around the world. Mothers often receive gifts on this day.

In the United States, Armed Forces Day is celebrated on the third Saturday in May. The day was created in 1949, and was a result of the consolidation of the military services in the Department of Defense. It was intended to replace the separate Army, Navy, Air Force, Marine Corps, and Coast Guard Days, but observance of these days, especially within each particular service, continues to this day.